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<head>
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  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    html,body {
      height: 100%;
    }
    .img{
      height: 93.29vh;
      background: blueviolet;
      position: relative;
      text-align: right;
      line-height: 3.67vh;
      font-size: 2vh;
    }
    .img img{
      height: 100%;
      width: 100%;
    }
    .shadow{
      width: 100%;
      height: 3.67vh;
      bottom: 0;
      left: 0;
      background: rgba(255, 255, 255, .5);
      position: absolute;
    }
    /* span {
      position: absolute;
      top:20%;
      right: 3%;
    } */
    .nav{
      height: 6.71vh;
      background: chartreuse;
    }
  </style>
</head>
<body>
  <div class="img">
    <img src="./images/src=http___n.sinaimg.cn_sinacn16_350_w690h460_20181121_7485-hnyuqhi6466138.jpg&refer=http___n.sinaimg.jpg" alt="">
    <div class="shadow">
      <span>迪丽热巴xxxxxxxxxxxxx系列</span></div>
    </div>
  <div class="nav"></div>
</body>
</html>
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  单位
  vw: 相当于浏览器窗口宽度的1%
  vh: 相当于浏览器窗口高度的1%
  vmax: vh和vw中较大的那个值
  vmin: vh和vw中较小的那个值
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